CN2329101Y - Ring shape side electrode spark plug sparkover along surface - Google Patents

Abstract

The utility model relates to a ring shape side electrode spark plug jump spark along a surface for a gasoline engine, and is composed of a central electrode which is connected with a wiring threaded rod, a side electrode which is connected with a casing body, an insulator, etc. The insulator of the spark plug is positioned the central electrode and the side electrode which is a ring side electrode. One end of the ring side electrode is fixed to the casing body, and the other end forms into a circular ring which is positioned the skirt periphery of the insulator. The insulator is projected out the upper surface of the side electrode. The utility model overcomes the defect of the existing spark plug sparkover along a surface so that the utility model has better jump spark performance and effectively meets the requirement for the hot performance of the spark plug for various gasoline engines.

Description

Along face arcing ring-type lateral electrode spark plug

The utility model relates to the spark plug that gasoline engine ignition is used, and relates in particular to a kind of along face arcing ring-type lateral electrode spark plug.

Up to now, spark plug sparking mainly contains dual mode: a kind of is under the pulse high-voltage effect, punctures the air gap that is present between central electrode and the lateral electrode, produces electric spark; Another kind is along face arcing mode, and promptly under the pulse high-voltage effect, its discharge route is to carry out along the porcelain insulator surface between central electrode and the lateral electrode.

Most in the market spark plugs all adopt the mode of air gap arcing.A major defect of this spark plug is that arcing distance is short, the arcing poor performance.This is because spark gap is subjected to the restriction of supply voltage, be generally about 0.6～0.9mm, when pulse high-voltage acts between central electrode and the lateral electrode, the gaseous mixture at spark gap place will absorb the heat in when discharge and activate because of ionization, produce chemical reaction, form fire nuclear.In normal spark gap, the place that fiery karyomorphism becomes is generally near the lateral electrode place, and heat will be absorbed by lateral electrode morely, and this is " the flame arrest effect " of electrode, and it has lowered the energy of spark, makes the arcing decreased performance.Strengthen spark gap and promptly strengthen arcing distance, the wall of lateral electrode is left in the place that fiery karyomorphism is become, the flame arrest effect of lateral electrode will reduce, the spark energy loss is little, ignitability improves, but excessive arcing distance makes the overtension that needs ignition coil to supply with, even can not supply required voltage because of power supply and " catch fire ".Too small spark gap also makes the gaseous mixture absolute magnitude that is in the spark gap place reduce except strengthening " flame arrest effect ", and the heat that this part gaseous mixture that burns is produced is as if less than the heat dissipation capacity of gaseous mixture towards periphery, and flame will be from horizontal blanking.Therefore, under the condition of supply voltage permission, always strengthen spark gap as far as possible, improve ignition performance to prolong arcing distance.But strengthen air gap (for example greater than 1.5mm) and must adopt high energy ignition unit simultaneously.

Along the face arcing spark plug arcing distance that can extend, because sparkover betides the interface of insulating barrier (as pottery) and air.Because the ceramic surface electric field distorts, creeping discharge is lower than air gap discharge breakdown voltage, and promptly under same breakdown voltage, the former arcing distance is longer than the latter.

The key factor of another influence discharge is the shape of electrode.Electrode is sharp more, and the voltage that discharge takes place is low more, because electrode shape influences the uniformity of Electric Field Distribution between electrode.Depress in same electrical, pointed electrode has longer arcing distance than circle or plate shape electrode.Spark plug on the market mostly has circular central electrode and plate shape lateral electrode, is unfavorable for improving ignition performance.

Once occurred several along face arcing spark plug.The earliest as shown in Figure 1 a kind of, insulator 1 does not have the skirt section, and it is got angry end diameter and mates with housing 2 mesopores, does not have the hot cell, does not have lateral electrode, and arcing is undertaken by the route of central electrode 3 along the end face of porcelain insulator 1 to housing 2.This spark plug is a utmost point cold mould, and the insulator tip temperature is very low during work, and is very sensitive to contamination, should electric capacity igniter big with ignition energy, that secondary voltage boosts fast be used.Be applicable to rotating speed height, power is big, discharge capacity is big motorcycle engine and revolving wormgear engine.

Fig. 2 is another kind of along face arcing spark plug.In the skirt section of insulator 1 becket 6 is arranged one, after pulse high-voltage is delivered to central electrode 3, form electric field between electrode, arcing will be carried out along ceramic surface and air gap between the central electrode 3--becket 6--housing 2, prolong arcing distance.Similar with it structure (Fig. 3) is that insulator 1 skirt section has a bulge loop 7, and to replace the becket 6 of Fig. 2, the manufacture difficulty of these two kinds of spark plugs is big, cost is high at the conical surface metallizing layer of bulge loop, and the metal level of coating also lost efficacy because of contamination.

The purpose of this utility model provide a kind of superior performance along face arcing spark plug, this spark plug will overcome the defective of existing spark plug along the face arcing, make it have better arcing performance; The purpose of this utility model also be to provide a kind of discharge take place easily and also adjust easily the spark plug parameter along face arcing spark plug; The purpose of this utility model also is to provide and can satisfies the requirement of different petrol engines to the spark plug hot property effectively, can keep the stable of spark gap again, and its manufacturing process is also simpler, thereby is applicable to various types of petrol engines.

Technical solution of the present utility model is: a kind of gasoline engine ignition use along face arcing ring-type lateral electrode spark plug, comprise the central electrode that joins with wiring screw rod, compositions such as the lateral electrode that is connected with housing, insulator, it between central electrode and the lateral electrode spark plug insulator, it is characterized in that lateral electrode is a ring-type lateral electrode, ring-type lateral electrode one end is fixed in housing, and the other end becomes an annulus, be positioned at around the insulator tip, insulator protrudes in the last plane of lateral electrode.Arcing will be carried out along the porcelain insulator surface between central electrode and the lateral electrode.

To be lateral electrode at the interior ring edge thickness near insulator be thinner than further improvement of the utility model connects the shell position, and ring thickness is about 1/3rd of metal lenticular wire thickness in the lateral electrode, (is general t1＜1/3t).Referring to Fig. 4, to reach the purpose of point discharge.Have 2-4 metal leg to be connected with the end face of housing 2, lateral electrode 4 is a circulus.

Characteristics of the present utility model are:

The first, insulator tip protrudes in outside the lateral electrode, is exposed to more in the burning gases, absorbs more heat, when low speed, low load operation higher working temperature is arranged, and avoids the greasy dirt carbon deposit; When high speed, high load capacity, though the exposure situation is identical, the interior gas flow of cylinder this moment is also stronger, and maximum temperature improves few, has enlarged the acclimation to heat scope of spark plug effectively.

Second, because along the face arcing, electric spark burnouts the outstanding lateral electrode of insulator tip greasy dirt carbon deposit partly, avoid the bridging between the electrode, also avoided causing electric current to leak the phenomenon of not arcing because of adhering to combustion deposit between insulator that air gap arcing spark plug is easy to generate and the housing.The arcing reliability is greatly improved.

The 3rd, arcing distance is long, need not adorn high energy ignition unit, under normal supply voltage, can obtain the arcing distance than long 3～5 times of air gap.Because " the flame arrest effect " of spark length, electrode reduces greatly, the fire nuclear that arcing can produce has high energy, and it is big to be in interelectrode gaseous mixture absolute magnitude, light the heat that this a part of combustion mixture produces, substantially exceed the heat that gaseous mixture towards periphery distributes, make flame be able to bamboo telegraph, has good ignition quality, and making mixture combustion complete, the discharge capacity of harmful active gases reduces, and can improve dynamic property, fuel economy and the behavior in service index of engine.

The 4th, ring thickness is thin in the lateral electrode, and the point discharge effect is arranged.Compare with other spark plugs of not attenuation of lateral electrode thickness, puncture voltage is lower.In the fire trial of normal temperature pressure, under identical pulse high-voltage, the wedge shape lateral electrode of thickness attenuation can be born bigger draught head and continuously arcing, is specially adapted to the engine of high compression ratio.

The 5th, can realize the arbitrfary point arcing in 360 ° of scopes, electrode erosion is even, long service life, and do not need the adjusting play, make engine under full operating mode, all have good operation stability.

The utility model is described in further detail below in conjunction with accompanying drawing with by embodiment:

Fig. 1-3 is the prior art constructions schematic diagram,

Fig. 1 is that utmost point cold mould is along face arcing spark plug configuration schematic diagram

Fig. 2 for the skirt section front end of insulator add one becket along face arcing spark plug schematic diagram

Fig. 3 for the skirt section of insulator have a bulge loop, bulge loop taper seat metallizing layer along face arcing spark plug schematic diagram

Fig. 4 is that the utility model is along face arcing ring-type lateral electrode spark plug schematic diagram

Fig. 5 is the ring-type lateral electrode schematic diagram of interior ring edge thickness attenuation among Fig. 4.

Fig. 6 is the top vertical view of Fig. 4 structural representation

Embodiment 1: the utility model--along face arcing ring-type lateral electrode spark plug shown in Fig. 4-6: constitute by insulator 1, central electrode 3, wiring screw rod 5, housing 2, ring-type lateral electrode 4 and seal washer etc.

Above-mentioned insulator 1 is the tubular porcelain body of common spark plug insulator.Plane on the outstanding lateral electrode of assembling back insulator tip front end, seating height of plug insulator will be according to the thermal characteristics design of spark plug.Skirt section and housing mesopore constitute the hot cell, make skirt surface absorb enough heats, and reach and eliminate greasy dirt carbon deposit necessary " burn-off temperature ", can only be the defective of utmost point cold mould thereby avoid the first generation along face arcing spark plug.

Described central electrode 3 is the metal round rod body structure of common central electrode.According to the thermal characteristics requirement, can adopt copper core combination electrode or nickel-base alloy electrode.The rear end of central electrode and the wiring screw rod of coaxial line 5 usefulness conductor glass-sealing agents connect firmly and are integral, be packed in the inner chamber of insulator 1, the length that central electrode stretches out insulator can overcome latter's central electrode and be exposed to the defective that causes quick ablation in the combustion chamber too much than the short 2mm of side formula air gap spark plug.

Described housing 2 is the metal cylinder planform of common spark plug.Front end installation side electrode at housing screw thread position, vertical 4 metal lenticular wires of welding (cross section is a rectangle) are an end of lateral electrode, through die-cut its length unanimity that makes, with mould it is bent again, the end with bending flattens simultaneously, four electrodes fuse after flattening, thickness t 1＜the 1/3t of middle part goes out mesopore then, and aperture is greater than the diameter of insulator tip corresponding site, constitute the ring-type lateral electrode, its outer shroud is natural shaped petal-shaped (as shown in Figure 6) after the punching press.The inside and outside sealing means of spark plug is identical with conventional ignition plug with the structure assembling, thereby makes simply, and the product parts versatility is big.

Described wiring screw rod 5 and seal washer are with spark plug is identical usually.The inside and outside seal form of spark plug is all identical with conventional ignition plug, spark plug after dressing up, its insulator tip protrudes in plane on the ring center electrode, and outstanding height is according to the voltage of supporting engine igniting system and the requirement decision of product thermal characteristics with it.Other embodiment: the annulus of ring-type lateral electrode 4 can promptly be welded on the housing by 2 or 3 metals connection shells; It also can be the metallic plate stamping parts.

Claims (5)

1. A gasoline engine ignition use along face arcing ring-type lateral electrode spark plug, comprise the central electrode that joins with wiring screw rod, compositions such as the lateral electrode that is connected with housing, insulator, it between central electrode and the lateral electrode spark plug insulator, it is characterized in that lateral electrode is a ring-type lateral electrode, ring-type lateral electrode one end is fixed in housing, and the other end becomes an annulus, be positioned at around the insulator tip, insulator protrudes in the last plane of lateral electrode.
2. 2. by the described spark plug of claim 1, it is characterized in that lateral electrode is thinner than the metal lenticular wire that connects the shell position at the interior ring edge thickness near insulator.
3. 3. by claim 1 or 2 described spark plugs, it is characterized in that the annulus of ring-type lateral electrode 4 can be connected on the shell by 2～4 metals.
4. 4. by claim 1 or 2 described spark plugs, it is characterized in that the ring-type lateral electrode made by metallic plate.
5. 5. by the described spark plug of claim 2, it is characterized in that ring thickness is about 1/3rd of metal lenticular wire thickness in the lateral electrode.

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